Michael Phelps wears shoes with his son's tiny footprint inside

Sure, Michael Phelps is famous for his record-breaking 28 Olympic
medals, but his three-month-old son Boomer might be the real star
of the Phelps family.
Boomer's become something of a celebrity since photographers
have spotted him in the crowd at the Rio games, often sporting
comically large headphones to protect his ears.

Getty Images/David Ramos

Now, the elder Phelps has revealed that he has a sweet way to
remind himself of his son when he's swimming: The inside of
his left shoe features Boomer's tiny footprint.

On Good Morning America today, Phelps was asked whether
having Boomer in the audience changed the experience of
competing. Here's what he said in response:

"When I got out of the warm-up pool for the last time, to get
ready to go up to the blocks [...] I put my shoe on and
I looked down at it, and I started to get emotional. Because I
knew he was in the stands."

Watch the entire adorable interview right here:

WATCH: So touching! Michael Phelps has his son Boomer's footprint in the bottom of the shoes he wore at the Rio 2016 Olympic Games: abcn.ws/2bexncI - Team USA